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Suppose one side of a pine wood block with thickness of 10 inch is in contact with a steam block at a temperature of 2200? and the other side of the block is at 380?. Calculate the heat transfer per hour. Use the relation for heat transfer Q= kA (T2- T1)/Δx where k is the thermal conductivity, T is the temperature in ?, and Δx is the thickness of the block. Assume thermal conductivity for the pine wood block is 0.81 Btu ft/hr ft2 ?.
A race car is moving with a velocity of 144 kilometers/hour. The driver applies the brakes, and the car comes to a halt in 12.0 seconds. What is the acceleration of the car after 12.0 seconds? A. -12 m/s^2 B. -3.3 m/s^2 C. 3.3 m/s^2 D. 10.3 m/s^2
determine the attractive force between myself 82kg and the earth 6.4 x10 24 as i stand on the earth r 6.0 x
A coil of wire has a resistance of 38.0 ? at 25° C and 43.7 ? at 51° C. What is the temperature coefficient of resistivity
A guitar string is77cm long and has a mass of 3.6 g. The distance from the bridge to the support post isL= 60 cm, and the string is under a tension of525N. What is the frequency of the first overtone
A 200-W infrared laser emits photons with a wavelength of 1.05 multiply.gif 10-6 m, and a 200-W ultraviolet light emits photons with a wavelength of 3.51 multiply.gif 10-7 m. What is the energy of a single infrared photon
Consider an electron constrained to travel in a one-dimensional box of length L. What is the length L of the one-dimensional box
A loudspeaker of mass 22 {rm kg} is suspended a distance of h = 1.60 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.30 {rm m}.
A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Determine the average angular speed (in rad/s) of this pulsar
Consider a spherical Gaussian surface which surrounds two electric charges (+Q), What is the net electric flux through the Gaussian surface
The electromagnet produces a field that is uniform throughout the volume between the faces. Describe the electric field that results in the region between the poles
A Helium-Neon laser (?=633 nm) illuminates a diffraction grating. What is the spacing between the slits of the grating
question1a car is stopped at a traffic light. it next travels along a straight road so that itsnbspdistance from the
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